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Thread Starter 

I have a pair of earphones that I intended to replace the plug on, however, I'm a little confused by the wires.  They have an inline remote/mic.

 

When I stripped off the outer sheath, I found Copper, Red and Blue, as expected, but inside the Green-stripped wire, I found another very fine White insulated wire hidden inside the White.   It's this extra little wire that has me confused.

 

Which do I use for the mic?

 

Thank you in advance for any advice.